docs: def del_bridge_port(name, port):
      ''' Delete a port from the named openvswitch bridge '''
      log('Deleting port {} from bridge {}'.format(port, name))
      subprocess.check_call(["ovs-vsctl", "--", "--if-exists", "del-port",
                             name, port])
      subprocess.check_call(["ip", "link", "set", port, "down"])
      subprocess.check_call(["ip", "link", "set", port, "promisc", "off"])